I was asked if I would share the specs to the 4th axis I made so I decided to.

here is the link for a .zip file with PDF files of the 4th specs I used
and a PDF on the part numbers for the belt, sprockets, bearings, seals, and stepper motor.

http://www.mechlinkv3.net/downloads/4th_Axis_Specs.zip

If anyone wants to use the design feel free too.